Haven't poked any holes in the plastic of a DR but the fitting proves it'll work great. DR and XRs have such larger plastic side panels, it's actually one of the easiest to mount. We include metric 'T nuts' for the XR so that you can access the airbox without removing the bag. (You will have to remove one of the bolts but it's really easy).

This is not actually installed but it'll fit a DRZ quite nicely.

And if you don't like the way it fits, send the un-used product back to us for a full refund!

Hey! There's my bike! I totally forgot you took pictures Dave.
Shameless bump for a great product!